I don't want to create a gorilla-survey here, but I would be interested in hearing some user experience with CA Reclaim. I first heard about it at SHARE several years ago, but we have yet to dip a toe in the crocodile pond. It would be most beneficial for system utility clusters like HSM and RMM, but that's the last arena I would want to encounter a problem.
. . . J.O.Skip Robinson Southern California Edison Company Electric Dragon Team Paddler SHARE MVS Program Co-Manager 323-715-0595 Mobile 626-302-7535 Office robin...@sce.com -----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of John Eells Sent: Tuesday, March 15, 2016 4:08 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: (External):Re: Freeing up space in a VSAM file Norbert Friemel wrote: <snip> > > CA_RECLAIM? > http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/dgt2d4a0/2. > 5.3.3 <snip> Norbert beat me to it (smile). The key to this being useful is that you have empty CAs to reclaim. One could have a pathological application that left one record per CA behind after deleting the rest, so that no CAs ever emptied out to be reclaimed, for example. Or, one could have an even *more* pathological application that wrote a lot of records into specific key ranges, deleted them all (causing reclaims) and then rewrote a lot of records into the same key ranges, causing CA reclaim/CA allocation thrashing to the detriment of performance. That said, it's very likely that using CA Reclaim will get you out of the reorg business, permanently, with no ill effects, for all of your KSDSs. CA Reclaim is available on all supported releases now, but I have heard of only one pathological application so far. Of course, it was one of ours here at IBM. (You can't make this stuff up.) -- John Eells IBM Poughkeepsie ee...@us.ibm.com ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
